Carl Sagan showing how it was determined the Earth was not flat thousands of years ago...
Adam Rifkin stashed this in Science!
Carl Sagan Globular Earth Deduced by Eratosthenes...
Stashed in: Best Videos, Carl Sagan, Carl Sagan, Mix Mux
To save this post, select a stash from drop-down menu or type in a new one:
10:07 PM Jan 30 2016